The vikings did not die out- they melted into the crowd and took up common cause with the Templars.
For hundreds of years, before, during and after the Templars were outlawed, the descendants of outlaw Viking kings and Templar families are documented to have intermarried first cousins on from Maidstone, Kent to Bornholm Island. This is one location and there are many more.
The documentation is overwhelming on genealogial websites.
Viking/Templar families controlled Sardinia and Sicily and other island kingdoms for generations. Viking strongholds became sanctuaries for Templars. The history is out there in plain view, but academics have their own secularized story to tell. Vikings converted to Christianity were natural allies with the outlawed Templar banking families empire.
When the Templar/Viking families moved to the New World, they went for the more southerly climate - to Virginia, North Carolina and on south. Genealogical history of the Templar Viking families is secret history - its complicated and would take more time to research than grant money allows.
That looks an awful lot like Scott W's.
The Vikings under Rollo were settled in what came to be called Normandy. We are beholding to them for the use of family names derived from land grants that were passed down from generation to generation. That habit makes it possible for many English (and Americans) to follow their heritage as far back as the ninth century AD.
Has any research been done on the thousand year old Viking remains regarding Neanderthal DNA?
The Originals TV series: vikings who settled in the South.